Profe&ianal
Biuatity,
Dual
Subwuufers
Pm
Composant de
professionnelle
bobine
6
8 deux voix.
Sistemas
de altavoz de calidad
ssionaf,
con
componente
e
voz dual.
SubwcmWrs4e
qualidade
issional
corn
bobina
para
M&k&
the U.S.A.
_
New
Ve/ocifyTM
Pro Component features
System design guidelines
Dual Voice Coil advantages
Subwoofer enclosure types
Subwoofer enclosure construction
Installation guidelines
Additional reference information
Limited warranty information
Technical support
VPC8D technical specifications and recommended box designs
VPCl
OD technical specifications and recommended box designs
VPCl2D
technical specifications and recommended box designs
VPCI
5D technical specifications and recommended box designs
Blaupunkt technical support summary sheet (fax sheet)
Other notes
1
2
3,4
485
6,7
8
8
9
9
28,29
30,31
32,33
34,35
36
37
Caracteristiques
des nouveaux
VelocityTM
composants Pro
10
Principes de conception du
systeme
11
Avantages de la bobine mobile a deux voix
12,13
Types d’enceintes de subwoofer
13,14
Construction d’enceintes de subwoofer
15,16
Principes d’installation du
systeme
17
References
17
Garantie
limitee
18
Soutien technique
18
VPC8D
specifications techniques et conception recommandee des enceintes
28,29
VPCl
OD specifications techniques et conception recommandee des enceintes
30,31
VPCl2D
specifications techniques et conception recommandee des enceintes
32,33
VPCl5D
specifications techniques et conception recommandee des enceintes
34,35
Blaupunkt demande de soutien technique
(feuille
de fax) 36
Autres notes
37
TEMAS
Nuevas Caracteristicas
VelocityTM
Pro Component
Principios de
disefio
del sistema
Ventajas de una bobina doble voz
Tipos de
caja
del altavoz
para
bajas frecuencias
Construccidn de la
caja
del altavoz
para
bajas frecuencias
Principios de instalacidn del sistema
Information de referencia adicional
Information de la garantfa
limitada
Apoyo
Tecnico
VPC8D especificaciones tecnicas
y
diseiios
recomendados de la saja
VPCIOD
especificaciones tecnicas
y
diserios
recomendados de la
caja
VPCl2D
especificaciones tecnicas
y
diseiios recomendados de la
caja
VPCl5D
especificaciones tecnicas
y
disetios
recomendados de la
caja
Blaupunkt hoja de resumen de apoyo
tecnico
(hoja fax)
Otras
notas
PAGINAS
19
20
21,22
22,23
24,25
26
26
27
27
28,
30,
32,
34,35
36
37
_i_
VeiocityTM
”
VPC” Pro Component subwoofers in order to
intrqduce
a series of loudspeakers
offering unparalleled value in the car audio market. The VPC performance standards were
increased yet we were able to drive the speaker costs down using improved manufacturing
techniques and high technology materials.
Unique to the new
Ve/ocityTMwoofers
is the “Dual Voice Coil” Technology. The primary
advantages of this design include the improved loudspeaker configuration flexibility and the
potential performance increases from higher power handling. Best of all, the consumer can
often achieve the performance of two single coil subwoofers with one VPC dual voice coil
speaker.
This manual is composed of several sections and offers brief discussions in each area.
New PRO COMPONENT FEATURES lists technical advancements of the VPC woofers.
SYSTEM DESIGN GUIDELINES addresses system layout, sound quality, and amplifiers.
SUBWOOFER ENCLOSURE TYPES discusses the trade-offs of popular box designs with
SUBWOOFER ENCLOSURE CONSTRUCTION reviewing basic box building techniques.
INSTALLATION GUIDELINES examines additional automotive installation concerns and
ONAL REFERENCE INFORMATION offers additional technical references for those
o learn more about car audio. BLAUPUNKT WARRANTY INFORMATION for the
applicable country is noted. BLAUPUNKT TECHNICAL SUPPORT provides telephone and
fax support numbers and addresses with the BLAUPUNKT TECHNICAL SUPPORT
SUMMARY SHEET formalizes your tech requests so they can be mailed in and/or faxed in
to our technical support people. Finally, in-depth TECHNICAL DATA
fo<
all PC woofers is
provided.
speaking,
95%
of the car audio subwoofer installations made today really don’t need $400
woofers with 100
oz
magnets! The VPC series woofers were designed for HIGH POWER
HANDLING LEVELS, HIGH SOUND PRESSURE LEVELS, and FLEXIBLE INSTALLATION
CHOICES.
HIGH POWER HANDLING was achieved
through a new ultra-linear long-throw
suspension with “bottomless” back plate
design allowing for tremendous cone
excursion without voice coil damage. The
new rigid spider design
(Blaupunkt
trademarked as “SPIDERMAX”) renders
spider tears a thing of the past. Double
-
DUSTCAP
thickness compressed foam surrounds
offer linear cone movement without tearing
from over-excursion. New Strontium
Ferrite magnets yield smaller magnet sizes
without reduced magnet strength but
retain their magnetic power far beyond the
expected life of the woofer. Four layers of
p
on
DuPont Kapton Polyamide voice
\,
1
Jobbins
with “Armorcoat” allow for voice coil temperatures exceeding nearly 400”
Fahrenheit without damage.
New basket designs prevent the back of the cone from
slapping the steel frame thus avoiding acoustical distortions and possible cone damage.
Rear vented pole plates allow fresh air to move in from behind the woofer to cool the voice
coil plus help prevent dust cap “popping” at the excursion limits.
-l-
SUPERIOR PERFORMANCE PARAMETERS for the new VPC units were strategically
balanced so that low resonant frequencies could be achieved along with high sound
pressure levels.
Cone mass is held to a minimum for high efficiency yet its Acrylic Resin
Laminate
(ARL)
design yields tremendous rigidity. The lighter the cone the easier it is for
the magnet to move it in and out; therefore, higher sound pressure levels for a given
amount of amplifier power input. Additional loudness is achieved through longer cone
travel so we designed the PC units with 0.25 to 0.35 inches (6-8
mm)
of peak-to-peak
excursion which is rarely found in component woofers of this price range.
INCREDIBLY FLEXIBLE INSTALLATION is the real benefit to the new Pro Components. The
PC woofers perform well in sealed, vented, and
bandpass
boxes. Due to the low resonance
values, they also work quite well in infinite baffle installations where the woofer is mounted
on the rear deck of a car and uses the trunk for its enclosure.
The best investment in system design is planning time.
Before building a house an architect
completely draws building plans. Although small modifications are often made throughout
construction, 99% of the home is built as planned. Exactly the same attitude must be
followed in the design of a car audio system and we therefore refer to it as “System
Architecture”.
MULTI-WAY SYSTEMS
Although a simple head-unit with four
speakers will provide reasonable sound, a
really good system almost always requires
some kind of subwoofer. In order to
include the subwoofer speakers a dividing
network must be installed that keeps the
low frequencies out of the midrange
speakers.
“Two-way
”
“crossovers” have a
crossover point set of 80 to 100 Hz for
example. You can go crazy with additional
crossover points and amplifiers (three-way,
five-way, etc.) but these should be left to
the better retail installers or high-end
hobbyists.
HMbuNrr
ELEclRoNlc
CROSSOVER
SCHANNEL
AMPlJflER
SUBwooFER
SOUND QUALITY VS. SPL
A well designed sound system can provide good sound quality and still play loud. Above
about 120
dB
(decibels) the sound isn’t perceived as getting much louder due to the
non-
linearities of the human ear. A loudspeaker with reference value of 90 d8 1 watt/l meter
will usually offer about 11 O-l 15
dB
inside a car if driven by an amplifier of about 100 watts
(more than enough for most listeners).
Good sound quality is achieved when a system offers several sonic attributes. IMAGING is
the accurate rendition of instrument placement which can only be achieved with proper
loudspeaker placement. STAGING is an extension of imaging where a perceived listening
event is recreated with well defined height, width, and depth as with an actual sound
stage. Correct FREQUENCY RESPONSE implies that all frequencies within the range of
human hearing
(20-20
kHz)
are audible and balanced in relation to one another.
TIMBR
(pronounced Tam-bur’) is the system’s ability to reproduce the sound signature of a tru
so that it doesn’t sound like a trombone. LINEARITY is the systems ability to provide
consistent frequency response regardless of volume setting. Some systems sound “shrill”
at high levels if the tweeters are over driven. They may also sound weak at low volumes
due to our psychoacoustic hearing effects which we perceive bass loss at low levels.
-2-
SYSTEM PLANNING
1
The largest possible impact on any audio
system (home or car) is the quality of
loudspeakers used and their placement.
EFFICIENCY defines how loud a speaker
will play for a given input power and is
often quoted at 1 watt input and measured
at a 1 meter distance. When designing a
system you want to keep the component
efficiencies as close as possible. Always
match components for efficiency and
complementing frequency response to
.i.
.
.i
+
...
:
.i_
j.
..
ensure smooth transition from low
::
_
_
_
::
s
.
.
.
.
I
i
P
:
4g
8
trequencles to hrgher ones for accurate
performance. Remember that for every 3
FREQUENCY
&I
‘.
”
dB
of increased efficiency
ISPL)
a speaker has over another, the end performance is as if
the amplifier has doubled it’s power output.
SPEAKER CONFIGURATIONS can become a problem in autosound installations. We would
hieve
a sound field in front of us (like a live concert) as compared to sound partly
front and partly behind us. This virtually dictates good midrange and tweeter
in front, usually mounted in the doors for good left/right balance, with high-pass
crossovers set greater than 80-100 Hz. For deep bass a subwoofer is required but is nearly
always located behind us in a rear trunk or hatch area. If the subwoofer crossover is too
high in frequency male voices can be heard “gurgling” out of the subwoofer speaker and
therefore pulls the sound-stage to the rear of the car, which is undesirable.
AMPLIFIER POWER is important but should be of lesser importance compared to speaker
choice and placement. Matching the rms (continuous) power levels to that of the speaker
is important but it should be noted that under-powering a system can often cause more
damage than slightly overpowering it. If the speakers are rated for 50 watts rms, you can
often drive them with a 100 watt power amp without concern. IMPEDANCE is the electrical
resistance to AC current flow and is typically 4 ohms for most car speakers. Impedance
loads for a speaker configuration shouldn’t fall below 2-4 ohms for most installations to
avoid amplifier overheating, regardless of manufacturer (Impedance = D.C. resistance of
the voice coil wire + A.C. resistance due to the coil of wire formed).
The Dual Voice Coil woofer is actually quite old in the home audio industry but still
relatively new to the car audio world. The largest advantage of the DVC woofer is in the
flexibility in installation. In order to raise the sound pressure level (loudness) in a car, you
can either add more speakers or add more amplifier power to drive a single speaker. Many
cars cannot fit two subwoofers and their necessary enclosure volumes but can easily fit
larger power amplifiers and a single woofer. Simply speaking, the DVC woofer allows you
to make up for speaker deficiencies with additional amplifier power.
There are basically four types of DVC installation: the ECONOMY MODE simply ties the
two voice coils together to yield more SPL; the LIMITED SPACE MODE uses higher
amplifier power to offset the need for a separate subwoofer and its enclosure; the
FLEXI-AMP MODE allows you to add a subwoofer to either a factory speaker installation or
channel amp in a “Tri-Mode” configuration; the HI-SPL MODE increases the perceived
Pressure Level in the car’s bass by loading down the output impedance of the
amplifiers thus‘achieving higher output power from the amplifiers. For any speaker loading
mode, care must
be taken to avoid loading the amplifier’s output below it minimum
impedance value
(e.g., 2 ohms).
-3-
Economy Mode
Flexi-Amp Mode
Limited Space Mode
HI-SPL Mode
e movement 0
e woofer cone back and forth. If a woofer cone
moves forward creating a positive pressure wave, this same motion creates a negative
pressure at the back of the woofer. If these two waves combine due to the lack of a wall
separating the front of the speaker sound from the back, the output from the woofer is
effectively canceled thus substantially reducing the bass output of the speaker. This wall is
absolutely necessary and is referred to as an acoustical “baffle”. It can be accomplished
using a box of some kind or simply the rear package shelf of an automobile to isolate the
front and back waves of the speaker.
THIELE-SMALL PARAMETERS
Every woofer has its own electromechanical characteristics which are called THIELE-SMALL
parameters. The three most important parameters include RESONANT FREQUENCY
(”
the frequency where the speaker moves with the least mechanical resistance), TOTAL
(“Qts”
-
the “magnification” of the cone movement at its resonant frequency), and
VOLUMETRIC COMPLIANCE
(“Vas”
-
the equivalent volume of air that the woofer cone can
displace for a given power input). Using these parameters we can then calculate an
optimum box volume for a particular woofer and reasonably predict its frequency response.
-4-
COMMON ENCLOSURE TYPES
In the car audio world there are 5 types of subwoofer enclosures commonly used; INFINITE
BAFFLE, SEALED BOX (closed box), VENTED BOX (bass reflex), SINGLE-VENTED
BANDPASS (often incorrectly referred to as “5th” order), and DUAL-VENTED BANDPASS
(often incorrectly referred to as “7th” order). No single design is superior because each has
its own compromise in performance, power handling, and design complexity. The
bandpass
name implies a “built-in” acoustical response which has a natural
highpass
response
(@
30
Hz for example) but also a
lowpass
response suppressing high frequencies (e.g.,
>80
Hz).
INFINITE BAFFLE designs simply use the trunk of the car
for its acoustical enclosure and the rear deck to isolate the
front and rear sound paths. Advantages include simple
installation and adequate performance for most systems.
Disadvantanes include poor power handling capability and
substandard transient response.
ED boxes offer one of the best compromises in
handling and performance. Because of the “air
”
provided by the box the advantaqes include simple
box construction, high power handling, excellent transient
response, and smooth low frequency roll-off.
Disadvantaqes include only moderate efficiencies at low
frequencies and the need for large box volumes.
VENTED boxes extend the low frequency response below
that of the sealed box by using a port tube. Advantaqes
include extended low frequency response, lower distortion
due to smaller cone movements in its passband, good
efficiency, good transient response, moderate size boxes,
and high power capacity. Disadvantages include increased
complexity in box design and possible woofer damage due
to over-excursion of the woofer cone below the cut-off
frequency of the vented box.
SINGLE-VENTED BANDPASS boxes are relatively new
(about 5 years in the
car)
but offer some advantages of
both the sealed and vented designs. Advantaqes include
reasonable efficiency, small box volumes, good transient
response, extended low frequency performance, and can
be used with very high power amplifiers. Disadvantaqes
include slightly lower efficiency compared to a vented box
and increased complexity in box design and construction.
DUAL-VENTED BANDPASS boxes vent the sound from the
front and back of the woofer through individually tuned
p
osure on the front and rear of the woofer. The
i
antaqe of this design is its high efficiency over a
narrow frequency band. Disadvantaaes include complex
design and construction, large box volumes, poor transient
response, and susceptibilities to cone over-excursions
(damage) for sound outside its primary frequency band.
-5-
ISOBARIC WOOFER
CONFIGURATIONS
Increasing in popularity in recent years is
the compound woofer design, more
commonly known as the “isobaric” design.
Isobaric actually means “constant
pressure” which is the case having two
woofers moving an encapsulated pocket
of air between them in the same direction.
This arrangement acts like a single speaker
which effectively reduces the required box
volumes for a subwoofer system by 50%
which is substantial if you are space
limited. Unfortunately, the trade-off for
space is the 3
dB
loss in efficiency but this
is usually recovered with increased
amplifier power. Care must be taken to
avoid air leaks between the two woofers
and final speaker wiring and impedance
loads must be carefully watched.
Before starting final box assembly some basic construction issues should be mentioned:
8
8
8
8
8
8
8
8
8
8
8
8
Infinite baffle construction in a car is done by simply cutting a piece of wood which will
act as an acoustical divider isolating the front and rear sound of the woofer. This piece
of wood is mounted inside the trunk of the car under the rear deck, or against the back
of the rear seat, and should have some kind of caulking to seal off all residual air leaks.
Box
constructiop
can take on nearly any shape since we are dealing with
low frequencies. Odd shapes that are difficult to cut and glue should be avoided.
Particle board, MDF, or high grade birch plywood are good materials to build boxes with
thicknesses of
5/8”-3/4”
(12-16 mm). Solid wood panels should actually be avoided
because of vibration potential and wood warping over time.
All seams in the box should be glued, screwed, and caulked to prevent wall separation
over time due to vibration and environmental changes within the car.
Cross bracing is important for large boxes to prevent wall vibration.
Acoustical damping material (fiberglass batting 2-4” thick) attached to 50% or more of
the interior walls helps reduce box noise and also increases the box volume seen by the
woofer by
lo-20%.
Spraying the inside walls with a damping material, such as tar
based automotive undercoating, also helps dampen wall resonances.
The final box should be rock solid and air tight but should also remain serviceable
should a woofer be damaged for any reason.
5-way binding posts for electrical connection offer reliable connections and easy
removal of the box for service or theft protection.
When possible, use
4”,
5”, or 6” diameter port tubes to avoid wind noise from smaller
diameter sizes. PVC plumbing pipe in 2, 3, 4, 5, and 6” diameters is available at most
hardware stores with “elbow” pipes allowing you to bend the tubes inside the box.
Try to always use active (electronic) crossovers built into most power amplifiers.
Regarding simple vented boxes, you cannot achieve lower frequency response by
simply lowering the port tuning frequency. This will severely
overdamp
the box
frequency response therefore yielding less bass and lower power handling.
The distance between the woofer and its port should be less than 12” if possible.
-6-
During box construction, temporarily assemble the box to make sure all pieces line up
properly. Then assemble all pieces before cutting out the holes for the woofers. Once the
box is fully assembled, connect an oscillator/amplifier to the woofer, sweep it through 20-
100 Hz, and listen for strange air whistling noises, buzzes, and rattles. Since the box will
eventually be mounted in a car it should be firmly fastened down. Simple
“L”
shaped
brackets work well.
BASIC MATH CALCULATIONS
To build a subwoofer box some very basic math calculations must be made accurately
referencing the formulas and drawings below:
VOLUME AND AREA CALCULATIONS
AREA:
VOLUME:
Circle (port opening) A = 0.79 x d x d
N/A
Rectangle
A=hxw
N/A
Triangle
A=0.5xhxw
N/A
Cylinder (Port tube)
N/A U = 0.79 x d x d x h
Rectangular box
N/A
V=hxwxd
N/A
V =
0.5xhxwxd
AREAS
0
d
II
-w-
VOWNES
t
h
I
8
c--w
--cl--
Speaker parameters and box calculations often need some kind of math conversions in
order to make the numbers easy to work with. Some common conversions are listed
below:
VOLUME AND AREA CONVERSIONS
TO CONVERT FROM: MULTIPLY BY:
TO GET:
Inches
0.0254
Meters
Meters
39.37
Inches
I
uare inches
pf”,
0.007
Square feet
‘k
,are
feet 144
Square inches
Cubic inches
0.00058
Cubic feet
Cubic feet
1728
Cubic inches
Liters
0.035 Cubic feet
-7-
We recommend that you have your Blaupunkt woofers professionally installed. If you
choose to do your own installation please note the following important information.
Before cutting any trim or steel make sure you clear all moving parts and factory
electrical lines.
Be sure to leave enough slack in the wire to prevent pulling or stretching wires for
service later.
Tie down all loose wires to prevent them from getting caught in moving parts or shorted
due to abrasion over time.
Never mount speakers in a car’s wheel wells or areas where they might be subjected to
moisture or road spray.
Proper speaker polarity must be observed. The polarity positive side is marked by a
(+)
sign or a red dot. At low frequencies woofers out-of-phase will acoustically cancel
having little bass output.
Although the components used in Blaupunkt speakers exceed most international
standard, speaker frames can be twisted by improper installation on uneven surfaces.
This can occur when the surface is heavily padded or carpeted and the screws are
unevenly or over-tightened.
When installing more than one speaker per amplifier channel be sure that the
combinr’
-.‘h
impedance values cannot damage the amplifier.
+@lJ
24
Speaker wire should be isolated from the electrical system of the car and routed away
from any factory systems to avoid noise picked up and fed back to the amplifiers.
Speaker wire size should be of sufficient size to carry the full power of the amplifier (16
gauge or larger sizes are quite adequate for most systems).
The following is a list of materials and sources of recommended reading for the person
interested in loudspeakers, acoustics, and electronics. Subjective comments are listed
accordingly.
DESIGNING, BUILDING, AND TESTING YOUR OWN SPEAKER SYSTEM, David B.
Weems, Copyright 1984, TAB books
#1964,
Blue Ridge Summit, PA, 17294. (This is
an introductory book on designing speakers for the home but is quite applicable to the
car and is easy reading)
LOUDSPEAKER DESIGN COOKBOOK, Vance
Dickason,
copyright 1991, distributed by
Old Colony Sound Labs, Peterborough, NH, 03458. (This is a technical step up from
Weems addressing complex woofer box and crossover designs but is excellent for
reference.)
SPEAKER BUILDER MAGAZINE, P.O. Box 494, Peterborough, NH, 03458. (This is a bi-
monthly hobbyist speaker magazine but offers tremendous technical information for the
professional as well.)
AUTOSOUND 2000 TECH BRIEFS, 2563 Eric Lane, Suite D, Burlington, NC, 27215.
(A2TB is a bi-monthly magazine with very current technical information directly related
to the car stereo world. Although sometimes technical, it’s well written therefore easy
to understand.)
“BLAUBOX” WOOFER BOX DESIGN COMPUTER PROGRAM, Blaupunkt division of the
Robert Bosch Corporation, 2800 South 25th Avenue, Broadview, IL, 60153. (This is
an IBM personal computer program used to predict the frequency response of a
subwoofer in 10 different enclosures including sealed, vented, bandpass, and isoba
configurations. Two woofers can be graphically compared in different boxes if desi
In addition, it will print out wood cutting “blueprints” to actually build the box with.
Passive Crossover designs are included. The program is sold through authorized
Blaupunkt retailers and distributors.)
-8-
The Robert Bosch Corporation warrants new Blaupunkt loudspeakers and accessories it
distributes in the United States to be free from defects in material and workmanship in
accordance with the following.
n For twelve (12) months after delivery to you, the original consumer purchaser, we will
repair or replace at no cost to you. However, this warranty does not cover expenses
incurred in the removal or reinstallation of any unit whether or not proven defective.
n
To obtain performance of this warranty, contact the nearest Blaupunkt dealer. A dated
purchase receipt or other proof that the product is within the warranty period will be
required in order to honor your claim.
n This warranty is limited to the original purchaser and is not transferable.
n
Specifically excluded from this warranty are failures caused by misuse, neglect, abuse,
improper operation or installation, or unauthorized repairs.
n
To the extent of the law, this warranty sets out your exclusive remedies with respect to
products covered by it, whether for negligence or otherwise. We will not be liable for
consequential or incidental damages, losses, or expenses. THIS WARRANTY IS IN LIEU
OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTV IMPLIED BY LAW,
WHETHER FOR MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE OR
OTHERWISE, SHALL BE EFFECTIVE ONLY FOR THE PERIOD THAT THIS EXPRESS
!@9
WARRANTY IS EFFECTIVE. No attempt to alter, modify, or amend this limited warranty
‘\..:’
shall be effective unless authorized in writing by an officer of the Robert Bosch
Corporation. Some states do not allow limitations on how long implied warranties last,
or the exclusion or limitation of incidental or consequential damages, so the above
limitations or exclusions may not apply to you. This warranty gives you specific legal
rights and you may also have other rights which vary from state to state.
n
This warranty is void for damage occurring during shipment and for,products with
defaced serial numbers or date code markings.
For further information regarding this warranty, please contact the Blaupunkt division of the
Robert Bosch Corporation, 2800 South 25th Avenue, Broadview, Illinois, 60153, attention
department
UA/CSV.
Products sold outside of the United States fall under the warranty
limitations of that country and its Blaupunkt division requirements.
We will make all reasonable efforts to help you, the end purchaser or Installation
Technician, to competently install these components. The Blaupunkt technical data
provided should assist in designing good subwoofer enclosures and answer most technical
questions.
Multiple computer programs currently exist for designing subwoofer enclosures but we
particularly recommend the “BLAUBOX” program offered by Blaupunkt through our retail
outlets. This IBM PC computer program easily and quickly assists in comparing the
acoustical frequency response of different woofers in different enclosures in hopes of
preventing a poor woofer/box combination.
BLAUBOX also prints out wood cutting
blueprints for tubular, rectangular, and wedge shaped enclosures so errors are virtually
eliminated by the user.
We realize there may be some very unique installations being done so we prepared a “fax
help” page that can be faxed or mailed to us which we will in turn answer as promptly as
possible. If you have other technical questions or would like additional literature on other
Blaupunkt products please contact our offices at:
Blaupunkt division of the Robert Bosch Corporation
F”
2800 South 25th Avenue
‘Broadview, Illinois, 60153 USA
i
708
-
865-
5200
Thank you for buying Blaupunkt..... BLAU NOW!
-9-
8”
SUBVVOOFER
-
TECHNICAL DATA
*
Nominal diameter
8.0 in
(2OOmm)
Magnet weight
20
oz
(0.56kg)
Nominal impedance
4
Q
(ea. coil)
DC resistance
(Re)
2.36
f2
(ea.)
Resonance frequency
(fs)
41 Hz
Total
0
factor
(Qts)
0.45
Mechanical Q
(Dms)
8.50
Electrical
Q
(QesI
0.48
Equivalent air volume
(I/as)
0.85
ft3
(23.9
ltr’s
Air volume displacement
0.07
ft3
(2.0
Itr’s)
Effective cone area
(Sd)
33.2
in2
(0.021
m*
Compliance
(Cms)
3.7 x
lo4
M/N
Moving mass
(Mms)
1.4
02
(419)
Voice coil diameter
1.5”
(38.lmm)
Voice coil former material Kapton polymide
Voice coil induct’ce
(@lOOHz)
0.65
mH
(ea.)
Linear excursion
(Itmax)
0.20 in (5.1 mm)
Force factor
(8f)
7.2 Tm
Acoustical efficiency (No)
0.40 %
Continuous power
(Pe)
16OW
(320 peak)
Sensitivity
(SPLI
92
dB,
2.83v/lm
89
dB,
lW/lm
. .
8.
(210
I-
b
5.80”(14~3
mm)
7.00”(17s
mm)
Woofer outline drawing
mechoic
woofer response
The VPC8D woofer offers the best performance/box size compromise
usin
0.75-l .OO cubic foot Vented box. The Sealed box drives the -3dB frequency very
high
(>80
Hz). An Infinite Baffle mounting (rear package shelf) is recommended only
for low power systems
(
< 75 watts) due to possible over-excursion of the driver.
The Slngle-Vented
Bandpass
box offers a slightly lower -3dB frequency than the
Vented box but the efficiency will drop considerably. The Single-Vented
Bandpass
box should therefore be used for installations requiring very high power handling
(>
100 watts) yet requiring the low cutoff frequencies offered by the Vented box.
l
(Parameter values may deviate
slightv
in production units
but
the perceived performance variations will be negligible.)
-28-
SINGLE-“ENTED
BANDPASS
BOX
“T
’
Togl
f
bon
VoLm
<Ml>
lo
120
66
0.25
0.50 6.20
15.30
84
17
110
60
0.30
0.70 6.40
15.40
84
12
loo
57
030
0.95
720
17.30
a3
!9
90
55
0.25
1.25
9.70
<NR>
91
<r-m>
.
90
1.50cu.ft.
0.25cu.ft.
20
so
.
mOlp
2On
VENTED BOX,
0.5 vs. 1.0
cu.ft.
10,
L
3
mu______________________
10
50
100
IQ
am
BANDPASS
BOX,
1.0 vs.
1.5
cu.ft.
IL
1 5
cu.Pt.
0
/+‘.
.:
.
.
.
.
!Y
.
.I
IO
SO
lrn
nz
am
am
[The
data above is offered as a “starting point” for comparison purposes because these designs are only a few of many possible
box configurations.
Be
sure to account for the air volume displacement of
the
woofers and the port tubes.
1
<NR>
= NOT A RECOMMENDED APPLICATION
-29-
IO” SUBWOOFER
-
TECHNICAL DATA
*
DC resistance
(Re)
I
3.12
Q (ea.)
Electrical
Q
(Qes)
I
0.38
Equivalent air volume
(Vas)
Air volume displacement
Effective cone area
(Sd)
Compliance
(Crns)
Moving mass
(Mms)
1.90
ft3
(53.8
ltr’sl
0.14
ft3
(4.0
hYs)
56.7
in2
(0.037m2)
2.8x1@
M/N
2.4
oz
(67n)
I
I
Voice coil diameter
I
2.0”
(50.8mm)
Voice coil former material
Voice coil induct’ce
(@lOOHz)
Kapton polymide
0.70
mH
(ea.)
Linear excursion
&naxI
Force factor
03ll
0.25 in
(6.4rnm)
11.3 Tm
Acoustical
efficiencv
(No)
I
0.70 %
Continuous power
(Pe)
180W (360 peak)
-
9.OOWO
mm)
wooter
outllne
drawing
I
Sensitivity
(SPL)
. I
94
dB,
2.83vtlm
I
Anechoic
woofer response
91
dB,
lW/lm
The
VPClOD
woofer offers the best performance/box size compromise using a simple
1.0-l .5 cubic foot Vented box. The Sealed box pushes the -3dB frequency high
(>
80 Hz) but this unit will work well in an Infinite Baffle mounting (car trunk) if using
moderate power levels
!
<
100 watts rms) to prevent bottoming of the woofer cone.
A 1.75 cubic foot Single-Vented
Bandpass
box offers a slightly lower -3dB frequency
compared to the Vented box. The
Bandpass
unit has considerably more power
handling compared to the Vented box (100-l 50 watts) but this is traded off for
slightly lower efficiency and increased construction complexity.
l
(Parameter values may deviate
srihtiy
\n
production units but the perceived
perfom3ance
variations will be negligible.)
-3o-
I”“”
BOX
Mmba
lube bmd
ms.
mm
mTh
ewy
laz’
lw3’
I.
D.
I.
D.
pat
Pm
SEALED BOX,
n
*
vs.
1.5 Cu.ft.
20
50
.
Irn
w
zm sm
VENTED BOX,
0.5 vs. 1.5 CU.ft.
10
50
am
BANDPASS
BOX,
1.25 VS. 1.75
cu.it.
10
so
Im
nz
zm sm
TThe
data
above
is offered as a “starting point” for comparison purposes because these designs are only a few of many
possiblf
box configurations. Be sure to account for the air volume displacement of the woofers and the port tubes. 1
<NR>
= NOT A RECOMMENDED APPLICATION
-31-
12” SUBWOOFER
-
TECHNICAL DATA
*
Nominal diameter
12.0 in
(3OOmm)
Magnet weight
40
oz
(1.14kg)
Nominal impedance
4
Q
(ea. coil)
DC resistance
(Re)
2.90
Q
(ea.)
Resonance frequency
(fs)
35 Hz
Total
Q
factor
(C&s)
0.42
Mechanical
0
(Qms)
8.14
Electrical
Q
(Qes)
0.44
Equivalent air volume
(Vas)
3.40
ft3
(96.2
ltr’s
Air volume displacement
0.19
ft3
(5.2ltr’s)
Effective cone area
(Scf)
82.5
in2
(0.053m2
Compliance
(Cms)
2.4x
lo4
MM
Moving mass
(Mrns)
3.0
oz
(849)
Voice coil diameter
2.0”
(50.8mm)
Voice coil former material
Kapton
polymide
Voice coil induct’ce
(@400Hz)
0.75
mH
(ea.)
Linear excursion
&ax)
0.25 in
(6.4mm)
Force
factor
(Bf)
ll.OTm
Acoustical efficiency (No)
0.93 %
Continuous power
(Pe)
200W
(400
peak)
Sensitivity
(SPL)
96
dB,
2.83vllm
93
dB,
lW/lm
-
0
\
Q
12.20”
(310
mm)
+c
0
Q
0
0
5.60”
143
mm)
Woofer outline drawing
l
(Parameter
values
may deviate slightly
h
production units
but
the
perceived
petfonnance
variations
win
be negligible.)
Anechoic
woofer response
The
VPC12D
woofer provides the best performance/box size compromise using a
1.5-
2.0 cubic foot Vented box. The Sealed box designs drive the -3dB frequency high
(>
70
Hz)
but the woofer cone has enough area that it will begin to “pressurize” the
car interior therefore offering strong bass performance.
Infinite Baffle mounting (rear
deck mounting) works well for moderate power levels
(@lo0
watts) due to the
pressurization principle noted above.
A 1.75 cubic foot Single-Vented
Bandpass
box will offer overall performance about
equal to that of a Vented box along with greater power handling (100-200 watts).
But, for many people, the box construction will require above average carpentry skill
-32-
SINGLE-VENTED
BANDPASS
BOX
SEALED BOX,
0.75 vs.
2.0 cu.ft.
110
lm..----------_____________
___-_
m
,.
. .
.
.
.
.
.
.
So
lrn
HZ
sm
VENTED BOX,
0.75 vs.
2.0
cu.it.
2m
am
I
I
BANDPASS
BOX,
1.75 vs.
3.5
cu.ft.
Im
I
_
_
_
_
_
_
_
_
_
__------------_--_
0
1.75
Cu.ft.
.*I'
,,/n’d
v
6
I
-
"'<
0
-ml_-_--__-__
,a*'
,I
-
_"'s,,_
_
_
-
_
-
-
_
_
,,/*
\
N
'I*,,
3.5
cu.ft.
'.a,
. . . . . . . .
'$
0
*
.
. .
10
50
im
)(z
zoo
sm
I
IThe
data above is offered as a “starting point” for comparison purposes because these designs are only a few of many
possibk
box configurations.
f3e
sure to account for the air volume displacement of the woofers and the port tubes.
]
< NR> = NOT A RECOMMENDED
AP!WCATlON
-33-
15”
SUBWOOFEB
-
TECHNICAL DATA
*
Nominal diameter
15.0 in
(38Omm)
Magnet weight
40 oz
(1.14kg)
Nominal impedance
4
f2
(ea. coil)
DC resistance
(Re)
3.08
R
(ea.)
Resonance frequency
(fs)
25 Hz
Total
Q
factor
(C&s)
0.46
Mechanical
0
(Qms)
8.50
Electrical
Q
(Qes)
0.49
Equivalent air volume
(vas)
9.50
ft3
(268
ltr’s)
Air volume displacement
0.36
ft3
(10.2 hr’s
Effective cone area
(Sd)
132
in2
(0.086m’)
Compliance
(Cms)
2.6 x
lo4
M/N
Moving mass
(Mms)
4.8 oz
(13591
Voice coil diameter
2.0”
(50.8mm)
Voice coil former material
Kapton polymide
Voice coil induct’ce
(@4OOHz)
0.85
mH
(ea.)
Linear excursion
&nax)
0.35 in
(8.9mm)
Force factor
(Bl)
11.6 Tm
Acoustical efficiency (No)
0.98 %
Continuous power
(Pe)
220W (440 peak)
Sensitivity
(SPL)
96
dB,
2.83v/lm
93
dB,
lW/lm
15.20”
(386 mm)
o!w
(13
mm)
;.90”
175
mm)
._.
_
Woofer outline drawing
Anechoic
woofer response
The
VPCl5D
woofer offers the best performance/box size compromise using a 3.0
cubic foot Vented box. The Sealed box pushes the -3dB frequency above 50 Hz but
an Infinite Baffle (trunk installation using the rear deck or back of the rear seats) can
offer tremendous results simply due to the pressurization of the car’s interior from so
much woofer cone area and movement.
A Single-Vented
bandpass
box approaching 6.0 cubic feet must be constructed to
provide the -3dB frequency similar to a Vented design. The advantage with the
bandpass
design is its tremendous power handling potential (200 watts +
1.
+
(Parameter values may deviate
slightly’in
prcduction
units
but
the perceived perbrrnance variations will be negligible.)
-34-
BOX
VT
f3
fa
PL
PL
SPL
0.75
<MI>
1.00
<NI>
1.50
155
140 15.75 111.15 193
I
SINGLfi-VENTED
BANDPASS
BOX
2.25 94
120 70
2.0
1.5
0.75
1.75 94
25 95
50 2.0 4.0 3.80
6.90 88
E
SEALED BOX,
1.5 vs. 3.0
Cu.ft.
.
.
. .
.
.
.
:
.
.
.
.
10
50
im
P
2m
sm
VENTED BOX,
1.5 vs. 3.0
Cu.ft.
110
Im..--__________--
__,_____-_--__-
70
. . . . , . . :
. .
. .
10
M
Irn
n2
2m
sm
110
BANDPASS
BOX,
3.5 vs. 6.0 cu.ft.
10 50
im
n2 200
sm
h
data above is
offered as a "starting
point” for comparison purposes because these designs are
only
a few of many possible
box
connations.
Be sure to account for the air volume displacement of the woofers and the port tubes.
1
<NR>
= NOT A RECOMMENDED
A!‘PLlCATlON
-35-
If you have questions regarding the Blaupunkt PC woofer products and/or installation,
please fill out this sheet and return by fax or mail. (At this time we can only provide
answers in English.)
FROM.
-.
NAME:
COMPANY:
STREET:
CITY & STATE:
ZIP CODE:
TODAY’S DATE:
DAYTIME PHONE:
DAYTIME FAX:
FAX OR MAIL TO:
BLAUPUNKT TECHNICAL SUPPORT
2800 SOUTH 25TH AVENUE
BROADVIEW, IL 60153
(FAX) 708-450-8554
(VOICE) 708-865-5200
NUMBER OF PAGES TOTAL:
1. What enclosure type do you have or want?
[
I
sealed
1
1 vented
[
1
bandpass
[
I
isobaric
[
]
other (define)
2. What Blaupunkt woofer model numbers are you working with?
3.
How many woofers are in the same cabinet
4.
How many port tubes do you have or want?
Diameter and length of each?
5. Do you want round (PVC pipe) port tubes or square?
[
I
round
6.
[
I
square
What is the total cubic volume of the enclosure you have or want?
(Maximum h x w x
d)
7.
How much amplifier power are you applying to each woofer?
[
1 cubic feet
1
I
liters
8.
Is there any other information we should know about your system?
Please draw box designs or add additonal information we might need for your system
below:
,
-36-
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